Books like Cherub 4~Robert Muchamore
Robert Muchamore
Cherub 4~Robert Muchamore is 320 pages, about 5 hours 52 minutes at 250 words a minute.
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How long each takes
Spy School 5.3 h 
Evil Spy School 5.9 h 
Scorpia 6.7 h 
Geronimo Stilton, Secret Agent 2.2 h 
Spy School Secret Service 6.5 h 
Snakehead 7.5 h 
Spy Ski School 6.4 h 
Spy School Goes South 6.5 h 
Never Say Die 6.6 h 
Chains 6.0 h 
Escape 2.3 h 
Crocodile Tears 7.1 h Bar height shows length. Estimated at 250 words a minute.